Riveting-tool.



` A. c. RoGBRsoN.

RIVBTING TOOL.

APPLICATION SILED MAB. 1o, 1911.

1,019,088. PatentedMan, 1912.

ALBERT cHoeu-:Y ,600519500 BVM5/hmm@ COLUMBIA PLANouRAPH co.. WASHINGTON n c UNTTED STATES PATENT OFFTCE.

ALBERT CHORLEY ROGERSON, OF MANCHESTER, ENGLAND, ASSIG-NOR OF ONE-HALF TO ARTHUR FREDERICK HALSTEAD, OF MANCHESTER, ENGLAND.

RIVETING-TOOL.

Specification of Letters Patent.

Patented Mar. 5, 1912.

To all whom t may concern:

Be it known that I, ALBERT CHORLEY ROG- nRsoN, a subject of the King of Great Bri`tain and Ireland, residing at Annandale House, Victoria Park, Manchester, in the county ofjLancaster, England, works manager, have invented new and useful Improvements in Riveting-Tools, of whichthe following is a specification.

The invention relates to an improved riveting tool for riveting to a new shape of head the water space stays such as are ap plied in connection with locomotive fire boxes, boilers, furnaces, &c.

The shape of stay head is of a precise form having a comparatively flat top and steep sides, and in which the bers of the metal are rolled over and assume a curved disposi-` tion, while the shaped head is brought very close down on the plate.

The shape of the stay head is got by means of the particular form of tool. It is found that by the use of such a tool as will be hereafter described, not only are the fibers of the metal rolled over and caused to distribute themselves in curved lines as indicated in Figure 1 of the drawings, but the head is caused to bed closely down and all around as regards its annular meeting edge upon the plate as the figure shows, and this close junction enables the stay head to better resist thermal erosion and gives a stay head of much greater strength. Further, the stay head is not cracked around the annular junction edge with the plate'which is a common defect with other forms of riveted stay head, because with my improved form oi tool, the metal follows the path of least resistance and is gradually rolled over, by the repeated action of the hammer and the tool.

Referring now to the accompanying drawings, F ig. l shows in section the precise shape of the stay head or the like, and clearly indicates the curved or arching disposition of the fibers whereby a better stay head results and the metal is brought down close to the plate of the fire-box. Fig 2 shows in section on a smaller scale the two plates of a locomotive fire-box with a stay, one end of such stay having been riveted to the desired shape by the improved tool. Fig. 3 shows in section the shape of the head when just formed by the tool. Fig. 4 is a longitudinal section of the tool. Fig. 5 is a face view thereof. Figs. 6 and 7 are similarly a longitudinal section and face View of the tool with a modification.

Thel improved tool is marked a and is forced on or fixed to a shank b which is inserted in the neck c in connection with the cylinder of a pneumatic hammer or percussive tool of suitable kind. The operative end of the tool is fashioned with three forming or pressing prongs a', a, a set at an angle of 120O to each other, but more than three such prongs may be used. The axis of the tool is bored out to provide a passage e. The design of the operative end of the tool and the prongs a is such that the tool will iinish the stay head to the desired shape. The stay head is not hemispherical but is nearly flat on the crown and steep at the sides as shown in Figs. l and 2. The steepness of the sides at f acts as a guide for the pronged tool making it self centering. The operator applies the tool to the projecting head of the stay, the prongs insuring a proper engagement, and during the repeated blows of the pneumatic hammer upon the tool rotates the tool irst in one direction and then the other by means of the attached handle g. The prongs a form the steep sides ofthe stay head, and as soon as these sides begin to assume shape they guide the prongs to form the desired shape of head concentric with the axis of the stay. This desired formation of head is assisted as the inner curved part z. of the tool is forming the dome of the head, by metal of the stay being forced into the hole c of the tool, which forms a small pap z' in the center of the stay head, temporarily blocking up the passage y' in the end of the stay where such passage is used, as shown in Fig. 3. This pap z' as it enters the hole e in the tool serves toV guide the tool in addition to the guiding effect due to the peculiar shape of the stay head, and the pap is afterward cut off, leaving the stay head of the shape shown in Figs. l and 2. Any excess of metal after the stay head has been formed may form a fin around the head, which could be cut oif by beveling the edges of the prongs a, or the prongs need not be beveled and the lin may be removed by a suitable tool.

The tool as shown in Figs. l and 5 may be used for making rivet heads of different shape to that indicated such as hemispherical or conical heads. The inner curved lpart h subsequently removing the pap.

, the construction of the 7tool and t-he method of theftoolwould Ibe shaped to the desired form of head and the central hole e Would afford a guide for centering the tool.

When forming a head as shown in Fig. 1 the steep sides f of the stay head serve in themselves to guide the tool When theyy begin to assume shape so that the provision of further guiding means'suchas is afforded by the center hole e in the tool is not essential to the success of the operation. In Figs. G and 7 the tool is shown Without such center. hole e, and the stay head is formed at once in the shape shown in Figs. l and 2 Without the center pap z', and Without the necessity of of using it, to obtainthe formation of the desired shape of stay head isthe same as already described. The-stay referred to may be of copper, brass, steel,iron or other metal or alloy.

I declare that What I claim isl. The riveting tool for-use With a pneu- Otherwise` matic hammer or the like, having prongs, formed internally to shape a stay head With a comparatively flat crown and steep sides, a handle to enable the tool to .be rotated by hand and a shank to insert in the neck of the cylinder of a pneumatic hammer, substantially as described.

2. The riveting tool for use With a pneumatic hammer or the like having prongs formed to shape a metal head of the desired form, with a central hole into which metal is forced as the head is being formed serving "to guide and center the tool, a handle to ena- Copies of this patent may be obtained forve cents each, by addressing the Commissioner of Patents,

' Washington, Dd G. 

